This paper presents an optimal carrier-based voltage balancing scheme for three-phase, three-level converters. The proposed scheme utilizes two available degrees of freedom, i.e. Zero-sequence Signal Injection (ZSI) and Virtual Zero-level Modulation (VZM), to eliminate the low-frequency neutral point voltage oscillation. It is universally effective over the full power factor and modulation index range and easy to implement in digital controllers. The hybrid algorithm combines the merits of both approaches, which offers the optimal performance regarding controllability, switching device power losses and output harmonics. The main drawbacks of VZM, i.e. the increased switching loss and high-frequency harmonics due to additional switching transitions, has been minimized in the proposed scheme. The performance of the proposed scheme is evaluated through simulation and experiment.
- DC-AC power converters
- three level converters
- voltage balancing
- Pulse Width Modulation
Wang, J., Yuan, X., Dagan, K. J., & Bloor, A. (2020). Optimal Neutral Point Voltage Balancing Algorithm for Three-phase Three-level Converters with Hybrid Zero-sequence Signal Injection and Virtual Zero-level Modulation. IEEE Transactions on Industry Applications, 56(4), 3865 - 3878. https://doi.org/10.1109/TIA.2020.2983659